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› Batterie Lipoly 8000 mah and wire section
05-31-2004 10:42 AM  13 years agoPost 1
franpla

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Spain

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Hello
I have batteries Lypoly 10s4p 8000 mah.
For 25 minutes fligh it means that the discharge is about 32-40 Amp. But the wire section betwen the batteries and the controler and motor (Actro 24-5 with actronic and control pannel v3) that comes with the heli are 2.5 mm (section). This section is not enough for the current above.
Can anyone help me to understand this question?... waiting your answer before conection batteries an motor.
Thanks

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05-31-2004 03:07 PM  13 years agoPost 2
d_wheel

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Deep in the heart of Texas.

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I believe you have miscalculated your current draw. For a 30 minute flight, you will have to limit your amperage to 16 amps or less. 32 amps might give you 15 minutes on a fresh pack.

Later;

D.W.

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05-31-2004 06:18 PM  13 years agoPost 3
franpla

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Spain

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first thank you very much for yours answer.

You are right about the amperes involved for tis time, but. Looking at the ACTRO 24-5 instructions, I read that this motor draw 40 Amperes for maximun efficiency and it comes with a wire with 2.5 mm diameter. it measn a 5 square mm section. An lloking at the AWG wires section, this section can draw just 15 amps.

Really I do not know where is the mistake.

Thanks.

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05-31-2004 06:27 PM  13 years agoPost 4
DannyBlackMagic

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Antwerp Belgium Europe

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The calculations are fore 1meter off 2.5 mm , the ecs have only 10 cm
no promlem , 100Amps are posibel without problems.

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05-31-2004 10:05 PM  13 years agoPost 5
franpla

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Spain

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O.K. but the meters of the wire is just important for the voltage drop. I am worry about the heating of the cable becouse of current (Amp). This is the problem.

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06-01-2004 06:11 AM  13 years agoPost 6
zoom

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Galveston, Texas

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who knows the formula for current?

DO you take the discharge rate for example 10C times the capacity of 800 mah the battery? or what?

If that is correct that would give me a discharge capacity rate of 8amps. Is this the correct way to figure out the amount of current a lipo can handle?

I'm just trying to figure out why my 830 mah TP 11.1v pack reaches temps of about 150F degrees.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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06-01-2004 07:00 AM  13 years agoPost 7
fritzthecat

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Virginia Beach, VA

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The 2.5mm wire is the standart size that goes into Sermos/Powerpole connectors. These connectors can handle up to 40 amps continuous. The AXI motors also come with 2.5mm wires and they are rated up to 40 amps. Same with the Castle Creations 45amp ESCs. All my electric stuff uses 14 gage wire and I run over 30 amps with no problem.
I doubt that the motor manufacturer put on a wire that is too thin to carry the current that the motor requires. The wire used is not the cheap household stuff but fine stranded pure copper stuff that is very expensive.
You were also looking at amp limits for transmission lines that run for miles. Here is a chart that will list the correct amps. Thay note that the amp limits are very conservative and can be increased for short battery cables.
http://www.powerstream.com/Wire_Size.htm

Fritz


'Send Money, Women and Guns!'

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